[asterisk-users] UK call initiating party hangup control on analoghome lines

[Roberts Klotins]

Hi Don,

All that you have posted is true however it is so for cases when
asterisk does not detect the caller from outside has hang up - and
continues to record VM thinking the caller is still speaking. 

My problem however is not in detecting remote hangups, but asterisk
hanging up and remote end (the caller) keeping the line open by not
hanging up.

Robert

On Tue, 2008-09-16 at 15:47 -0500, Don Kelly wrote:
> The wiki had this about UK POTS:
> 
> In the UK, if you are using BT and are having problems with Asterisk not
> detecting hangups when using a TDM400P, contact BT and ask what the current
> "Disconnect Clear Time" setting is for your phone line. Mine was set to 100
> and increasing it to 800 fixed the issue. "Disconnect Clear Time" (DCT) is
> BT's name for CPC. You will need to speak to the BT Faults service--they can
> check to see what your DCT/CPC is set to and reset it instantly to another
> value. 
> 
> BT have two analogue line specifications: single line (BT SIN 351), and
> multiline (BT SIN 352), which explain the different forward disconnect
> parameters (http://www.sinet.bt.com/). These specifications state that for
> single line (like most of us have), the disconnect time is between 90ms and
> 130ms, for multiline it is 800ms. My impression is that the rest of the
> World (North America included) has a disconnect time in excess of 500ms,
> this explains why the default behaviour of zaptel (Digium and Sangoma cards
> alike) don't play well with single line BT phone lines for disconnect
> supervision.
> 
> When ordering lines from BT - especially feature lines or business lines ask
> the sales person to set lines to PABX working.
> 
> And if none of this works, it looks like the "maxsilence" parameter could
> end voice mail recording and allow you to terminate the call.
> 
>   --Don
> 
> Don Kelly
> PCF Corp
> Real Support for your Virtual Office TM
> 651 842-1000
> 888 Don Kell(y)
> 651 842-1001 fax
> 
>  
> 
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Gordon
> Henderson
> Sent: Tuesday, September 16, 2008 3:08 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] UK call initiating party hangup control on
> analoghome lines
> 
> On Tue, 16 Sep 2008, Roberts Klotins wrote:
> 
> > Thanks Don,
> >
> > I have looked at that page and the described problem (when asterisk does
> > not detect remote (calling) party hangup) is exactly the opposite to my
> > case. In my case I learnt that for BT residential analog lines the
> > remote caller is entitled to hold the line open indefinitely, regardless
> > whether I hang up or not. So this seems to be a feature of BT rather
> > than a problem with asterisk.
> >
> > I do not know whether there are many countries where telco setup is
> > similar.
> 
> That might be worth a posting to usenet:uk.telecom ... I've a funny 
> feeling this is exchange dependant and it's not the same action for all 
> exchanges. I can call my home BT line, answer it, then hangup and the call 
> is cleared inside 10 minutes (usually 2-3) then I can make an outgoing 
> call.
> 
> I'm told that you need to tell BT that you have a PBX on the end of the 
> line, but I've never done that for any analogue installation I've done.
> 
> Gordon
> 
> 
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